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Machine — BBC micro:bit MicroPython 1.1.1 documentation

The machine module contains specific functions related to the micro:bit hardware. Most functions in this module allow to achieve direct and unrestricted access to and control of hardware blocks on a system (like CPU, timers, buses, etc.). Used incorrectly, this can lead to malfunction, lockups, crashes of your board, and in extreme cases, hardware damage.

machine.unique_id()

Returns a byte string with a unique identifier of a board. It will vary from one board instance to another.

machine.reset()

Resets the device in a manner similar to pushing the external RESET button.

machine.freq()

Returns CPU frequency in hertz.

machine.disable_irq()

Disable interrupt requests. Returns the previous IRQ state which should be considered an opaque value. This return value should be passed to the machine.enable_irq() function to restore interrupts to their original state, before machine.disable_irq() was called.

machine.enable_irq(state)

Re-enable interrupt requests. The state parameter should be the value that was returned from the most recent call to the machine.disable_irq() function.

machine.time_pulse_us(pin, pulse_level, timeout_us=1000000)

Time a pulse on the given pin, and return the duration of the pulse in microseconds. The pulse_level argument should be 0 to time a low pulse or 1 to time a high pulse.

If the current input value of the pin is different to pulse_level, the function first (*) waits until the pin input becomes equal to pulse_level, then (**) times the duration that the pin is equal to pulse_level. If the pin is already equal to pulse_level then timing starts straight away.

The function will return -2 if there was timeout waiting for condition marked (*) above, and -1 if there was timeout during the main measurement, marked (**) above. The timeout is the same for both cases and given by timeout_us (which is in microseconds).

The machine module allows you to read from the device’s memory, getting 1 byte (8 bits; mem8), 2 byte (16 bits; mem16), or 4 byte (32 bits; mem32) words from physical addresses. For example: mem8[0x00] reads 1 byte on physical address 0x00. This has a number of uses, for example if you’d like to read data from the nRF51 registers.

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